<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        button {
            width: 50px;
            height: 30px;
            border-radius: 3px;
            margin: 0 10px;
            cursor: pointer;
        }
    </style>
</head>

<body>
    <div id="app">
        <h2>当前计数: {{ counter }}</h2>
        <button @click='increment' :disabled='counter == 10'> + </button>
        <button @click='decrement' :disabled='counter == 0'> - </button>
    </div>

    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                counter: 1,
            },
            methods: {
                increment() {
                    this.counter++;
                },
                decrement() {
                    this.counter--;
                }
            }
        })
    </script>
</body>

</html>